Over-center fastener



FIG. 1 is a front elevational view of an over-center fastener in an opened position showing my new design;

FIG. 2 is a front elevational view thereof in a closed position;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an over-center fastener, as shown and described. 